Non-Gaussianity and Gravitational Waves from Quadratic and Self-interacting Curvaton

Abstract

In this paper we consider how non-Gaussianity of the primordial density perturbation and the amplitude of gravitational waves from inflation can be used to determine parameters of the curvaton scenario for the origin of structure. We show that in the simplest quadratic model, where the curvaton evolves as a free scalar field, measurement of the bispectrum relative to the power spectrum, fNL, and the tensor-to-scalar ratio can determine both the expectation value of the curvaton field during inflation and its dimensionless decay rate relative to the curvaton mass. We show how these predictions are altered by the introduction of self-interactions, in models where higher-order corrections are determined by a characteristic mass scale and discuss how additional information about primordial non-Gaussianity and scale dependence may constrain curvaton interactions.

17 pages, 10 figures; v2, typos corrected, figures easier to read

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• Constraints on primordial black holes from LIGO-Virgo-KAGRA O3 events
• Axion Dark Matter and Planck favor non-minimal couplings to gravity
• Non-Gaussianity in single field models without slow-roll
• Strongly scale-dependent polyspectra from curvaton self-interactions
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• The squeezed limit of the bispectrum in multi-field inflation
• Can Standard Model Higgs Seed the Formation of Structures in Our Universe?
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• Structural stability of spherical horizons
• Purely quadratic non-Gaussianity from tachyonic instability: Primordial black holes and scalar-induced gravitational waves
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